Sound-control mechanism.



N.. KOLBY.

SOUND CONTROL MECHANISM.

APPLICATION FILED JUNE 14. 1917.

1,256,025. Patented Feb.12,1918.

' 2 SHEETS-SHEET I.

N. KOLBY.

SOUND CONTROL MEGHAMSM. APPLICATION F1LEDJUHE14.19|7,.

13,256,025. Patnted Feb. 12,1918. Q 2 SHEETS-SHEET 2.

/ 24 Hwun j; 1

mcoLAs 'XoLBY, or. CHICAGO, ILLINOIS.

SOUND OONTROL MECHANISM.

rTo all whom it'may concern:

:zen of the'United 'icagoy'in the county. of Cook and State of Illinois, have invented certain new and useful Improveinentsin Sound-Control Mecha- "part of this specification and in which like numerals are employed to designate. like.

Be it known that I, NICOLAS KOLBY, a citi- States, residing at Chinism, of which the following is a specification.

My invention relates to improvements in volume controlling apparatus for sound re producing machines.

An important object of the invention is to provide apparatus of the above mentioned character, which is attractive in appearance, highly eflicient in operation, and convenient to actuate.

' Other objects and advantages of the'in- 'vention will be apparent during the course of the'following description.

' In the accompanying drawings forming a apparatus ment of my invention, the numeral 10 desig nates the cabinet of a sound reproducing machine, having a sound chamber 11. The forward side of this sound box is provided with an opening 12.

Arranged at the top and bottom of the opening 12, and within the sound chamber 11, are tracks 13, held stationary by any suitable means. These tracks are preferably U-shaped in cross-sectiomas. shown inFig. 2. The tracks comprise straight central portions 14, and curved end portions 15, extending rearwardly' within the sound chamber 11.

The numeral 16 designates flexible or foldable panel-curtains, having their upper and lowerends operating within and guided by the tracks 13. -The panel-curtains 16 are preferably formed of slats. or panels 17 of wood or other material, which are secured (to a flexible strip 18,- such as cloth.

v Specification of Letters Patent.

the panel-curtains wherein for the purpose of illustration is shown a preferred embodi tracks arranged Patented Feb. 12, 11918.

Application filed .Tune 14, 1917. Serial No. 174,717.

The numeral 19 designates levers, arranged near the bottom 20 of the sound box 11 and attached to the outermost slats 17 of 16, as shown at 21. The levers 19 are pivoted to the bottom 20, as shown at 22. The curved portions 15 of the tracks 13 are concentric with respect to the pivots 22.

The levers 19 project inwardly beyond the pivots 22 for a substantial distance and have pivotal connection, as shown at 23, with links 24, pivoted to the ends of a bar 25, .as shown at 26. Means are provided to reciprocate the bar 25 transversely, comprising a rod or bar 27, secured thereto as shown at 28, and operating in a longitudinal groove 27 The forward end of the bar 27 operates within an opening formed in a guidemember 29, and the rear end thereof operates beneath the guide. 30, which are stationary, as is obvious. Connected with the forward end of the rod 27 is a handle or knob 31, for shifting it. V

The operation 'of the apparatus is as follows:

To close the panel-curtains 16, the bar 27 is moved inwardly. This movement of the bar 27 shifts the bar 25 inwardly which pulls upon. the links 245, swinging the forward ends of the lever 19 toward each other, and sliding the panel-curtains to the closed position. When the knob 31 is drawn forwardly, "it'is obvious that the opposite of this operation occurs, and the panelcurtains 16 will be shifted to the open position. By proper manipulation of the knob 31, the panel-curtains 16 may be opened to any desired extent, thus controlling the volume of sound from the machine.

It is to-be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit ofthe invention or joined claims.

Having thus described my invention, I claim:

1. The combination with a sound chamber of a sound reproducing machine having an opening; of'substantially horizontal near the top and bottom of the opening and extending longitudinally the scope of the subthereof and having" rearwardly curved end portions; pivoted levers arranged inwardly with the levers; a reciprocatory rod extending longitudinally of the sound chamber near theicentral portion thereof; and operating connecting means between the rod and the corresponding ends of the levers.

2. The combination with a sound chamber of a sound reproducing machine having an opening; of substantially horizontal tracks arranged near the top and bottom of the opening and extending longitudinally thereof and having rearwardly curved end ortions; swinging levers arranged inwardly of and near the curved track end portions; pivot supports for the levers arranged between the ends thereof with the inner ends ofthe levers extending rearwardly beyond the same 'for substantial distances, said pivot supports being concentric with respect to the curved track end portions and the rear ends of the levers being arranged upon the inner sides of the pivot supports; flexible panel curtains arranged to operate within the tracks and having connection with the forward ends of the levers; a reciprecatory rod extending longitudinally of the sound chamber and near the central portion thereof; a transverse member secured to the rod; and links connected with the ends of the transverse member and with the rear end of the levers, so that the panel curtains will be in the closed position when the reciprocatory rod is moved to the inner position.

- 3. The combination. with a sound ehama ber of. a sound reproducing machine havthereo'f and ing an openingro'f substaiitiall}, llOIlZOHtai tracks arranged near the top and bottom of the opening and extending long1tudi nally thereof and having rearwardly curved disposed permanently upon one side of the pivots of t-helevers; a transversely reciproeatery bar pivot ally connected with the ends of the links; and a reciprocatory rod rigidly attached to the bar between its ends and projecting to the exterior of the sound chamber.

-l. The combination with a sound chamber of a sound reproducing machine having an opening, of substantially horizontal tracks arranged near the top and bottom of the opening and extending longitudinally having rearwardlv curved transverse end portions; a pivoted lever arranged inwardly of and near the curved transverse end portion-with its pivot disposed concentric with respect to the curved end portions otthe tracks; a flexible panel. curtain arranged to operatein contact with the track and having connection with the forward end of the lever; and means to swing the lever upon its pivot.

In testimony whereof I a'iiix my signature in presence of a witness.-

nicotine "KoLBY.

Witness; p

Brianna Josnr TX'IINKLE. 

